sagemathgh-37076: src/sage/tests/gap_packages.py: remove
    
These tests for the installed GAP packages are problematic in a world
where Sage can use GAP from the system. Particularly, loading _all_
installed GAP packages is not a safe operation when there might be an
enormous number of them.

Moreover, with the system GAP, it's not really Sage's reponsibility to
ensure that the installed packages load. It _would_ be nice to know that
any extra packages from the gap_packages SPKG are installed correctly;
however, that type of test would be more appropriate in that SPKG's
spkg-check phase.

Dependencies:

- sagemath#37049
    
URL: sagemath#37076
Reported by: Michael Orlitzky
Reviewer(s): Antonio Rojas

Author: Release Manager

.github/workflows/ci-conda-known-test-failures.json

@@ -76,8 +76,5 @@
     },
     "sage.structure.coerce_actions": {
         "failed": "random failure https://github.com/sagemath/sage/issues/35973"
-    },
-    "sage.tests.gap_packages": {
-        "failed": true
     }
 }

build/pkgs/configure/checksums.ini

@@ -1,4 +1,4 @@
 tarball=configure-VERSION.tar.gz
-sha1=c72fc2006b1702e74f38c480b0376e3e6c8a5758
-md5=a650e8682fe75708f679eabe918d2aa7
-cksum=785462498
+sha1=8124eeddb2d440bd40f9656a8f69ce53175a4706
+md5=db7e8fb79c8cd9a69e8cc6865e43add9
+cksum=719116257

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-919b021b0c103e4fb798cc784218015e0a515510
+0c16f847a4db786d105c48e79bf3bc3fe07d82fc

src/doc/bootstrap

@@ -210,4 +210,4 @@ cat <<EOF
 
 EOF
 ) > "$OUTPUT_INDEX"
-sage-package list --has-file SPKG.rst | OUTPUT_DIR=$OUTPUT_DIR OUTPUT_RST=1 xargs -P 0 -n 1 sage-spkg-info
+sage-package list --has-file SPKG.rst | OUTPUT_DIR=$OUTPUT_DIR OUTPUT_RST=1 xargs -P 99 -n 1 sage-spkg-info

src/doc/en/reference/references/index.rst

@@ -2444,6 +2444,11 @@ REFERENCES:
              J. Graph Algorithms and Applications 15 (2): 269-293, 2011.
              :doi:`10.7155/jgaa.00226`, :arxiv:`0705.1025`.
 
+.. [EPSV2023] Jonathan Komada Eriksen, Lorenz Panny, Jana Sotáková, and Mattia Veroni.
+              Deuring for the People: Supersingular Elliptic Curves with Prescribed
+              Endomorphism Ring in General Characteristic.
+              LuCaNT 2023. https://ia.cr/2023/106
+
 .. [Eri1995] \H. Erikson.  Computational and Combinatorial Aspects
              of Coxeter Groups.  Thesis, 1995.
 

src/sage/categories/unital_algebras.py

@@ -107,20 +107,7 @@ def __init_extra__(self):
                 0
                 sage: F(3)
                 3*B[0]
-
-                sage: class Bar(Parent):
-                ....:     _no_generic_basering_coercion = True
-                sage: Bar(category=Algebras(QQ))
-                doctest:warning...:
-                DeprecationWarning: the attribute _no_generic_basering_coercion is deprecated, implement _coerce_map_from_base_ring() instead
-                See https://github.com/sagemath/sage/issues/19225 for details.
-                <__main__.Bar_with_category object at 0x...>
             """
-            if getattr(self, '_no_generic_basering_coercion', False):
-                from sage.misc.superseded import deprecation
-                deprecation(19225, "the attribute _no_generic_basering_coercion is deprecated, implement _coerce_map_from_base_ring() instead")
-                return
-
             base_ring = self.base_ring()
             if base_ring is self:
                 # There are rings that are their own base rings. No need to register that.

src/sage/homology/free_resolution.py

@@ -7,7 +7,7 @@
 
 .. MATH::
 
-    R^{n_1} \xleftarrow{d_1}  R^{n_1} \xleftarrow{d_2}
+    R^{n_0} \xleftarrow{d_1}  R^{n_1} \xleftarrow{d_2}
     \cdots \xleftarrow{d_k} R^{n_k} \xleftarrow{d_{k+1}} 0
 
 terminating with a zero module at the end that is exact (all homology groups
@@ -242,9 +242,20 @@ def _repr_module(self, i):
             'S^2'
             sage: r  # indirect doctest
             S^1 <-- S^3 <-- S^2 <-- 0
+
+        TESTS::
+
+            sage: S.<x,y,z> = PolynomialRing(QQ)
+            sage: I = S.ideal(0)
+            sage: C = I.free_resolution()
+            sage: C
+            S^1 <-- 0
         """
         if i == 0:
-            r = self._maps[0].nrows()
+            if self._length > 0:
+                r = self._maps[0].nrows()
+            else:
+                r = self._initial_differential.domain().dimension()
             s = f'{self._name}^{r}'
             return s
         elif i > self._length:
@@ -422,6 +433,8 @@ def __getitem__(self, i):
             raise IndexError('invalid index')
         elif i > self._length:
             F = FreeModule(self._base_ring, 0)
+        elif i == 0:
+            F = self.differential(0).domain()
         elif i == self._length:
             F = FreeModule(self._base_ring, self._maps[i - 1].ncols())
         else:
@@ -444,11 +457,12 @@ def differential(self, i):
             sage: r
             S(0) <-- S(-2)⊕S(-2)⊕S(-2) <-- S(-3)⊕S(-3) <-- 0
             sage: r.differential(3)
-            Free module morphism defined by the matrix []
-              Domain:   Ambient free module of rank 0 over the integral domain
-                        Multivariate Polynomial Ring in x, y, z, w over Rational Field
-              Codomain: Ambient free module of rank 2 over the integral domain
-                        Multivariate Polynomial Ring in x, y, z, w over Rational Field
+            Free module morphism defined as left-multiplication by the matrix
+             []
+             Domain:   Ambient free module of rank 0 over the integral domain
+                       Multivariate Polynomial Ring in x, y, z, w over Rational Field
+             Codomain: Ambient free module of rank 2 over the integral domain
+                       Multivariate Polynomial Ring in x, y, z, w over Rational Field
             sage: r.differential(2)
             Free module morphism defined as left-multiplication by the matrix
               [-y  x]
@@ -476,6 +490,31 @@ def differential(self, i):
                     [-z^2 + y*w]
                     [ y*z - x*w]
                     [-y^2 + x*z]
+
+        TESTS::
+
+            sage: P2.<x,y,z> = ProjectiveSpace(QQ, 2)
+            sage: S = P2.coordinate_ring()
+            sage: I = S.ideal(0)
+            sage: C = I.graded_free_resolution(); C
+            S(0) <-- 0
+            sage: C[1]
+            Ambient free module of rank 0 over the integral domain
+             Multivariate Polynomial Ring in x, y, z over Rational Field
+            sage: C[0]
+            Ambient free module of rank 1 over the integral domain
+             Multivariate Polynomial Ring in x, y, z over Rational Field
+            sage: C.differential(1)
+            Free module morphism defined as left-multiplication by the matrix
+            []
+            Domain: Ambient free module of rank 0 over the integral domain
+             Multivariate Polynomial Ring in x, y, z over Rational Field
+            Codomain: Ambient free module of rank 1 over the integral domain
+             Multivariate Polynomial Ring in x, y, z over Rational Field
+            sage: C.differential(1).matrix()
+            []
+            sage: C.differential(1).matrix().dimensions()
+            (1, 0)
         """
         if i < 0:
             raise IndexError('invalid index')
@@ -484,14 +523,17 @@ def differential(self, i):
                 return self._initial_differential
             except AttributeError:
                 raise ValueError('0th differential map undefined')
-        elif i == self._length + 1:
-            s = FreeModule(self._base_ring, 0)
-            t = FreeModule(self._base_ring, self._maps[i - 2].ncols())
-            m = s.hom(0, t)
         elif i > self._length + 1:
             s = FreeModule(self._base_ring, 0)
             t = FreeModule(self._base_ring, 0)
-            m = s.hom(0, t)
+            m = s.hom(0, t, side='right')
+        elif i == self._length + 1:
+            s = FreeModule(self._base_ring, 0)
+            if self._length > 0:
+                t = FreeModule(self._base_ring, self._maps[i - 2].ncols())
+            else:
+                t = self._initial_differential.domain()
+            m = s.hom(0, t, side='right')
         else:
             s = FreeModule(self._base_ring, self._maps[i - 1].ncols())
             t = FreeModule(self._base_ring, self._maps[i - 1].nrows())

src/sage/logic/booleval.py

@@ -23,15 +23,15 @@
     sage: booleval.eval_formula(t, d)
     False
 """
-#*****************************************************************************
+# ****************************************************************************
 #       Copyright (C) 2006 Chris Gorecki <[email protected]>
 #       Copyright (C) 2013 Paul Scurek <[email protected]>
 #
 #  Distributed under the terms of the GNU General Public License (GPL)
 #  as published by the Free Software Foundation; either version 2 of
 #  the License, or (at your option) any later version.
-#                  http://www.gnu.org/licenses/
-#*****************************************************************************
+#                  https://www.gnu.org/licenses/
+# ****************************************************************************
 
 from . import logicparser
 
@@ -72,8 +72,8 @@ def eval_formula(tree, vdict):
     """
     global __vars
     __vars = vdict
-    b = logicparser.apply_func(tree, eval_f)
-    return b
+    return logicparser.apply_func(tree, eval_f)
+
 
 def eval_f(tree):
     r"""
@@ -104,6 +104,7 @@ def eval_f(tree):
     """
     return eval_op(tree[0], tree[1], tree[2])
 
+
 def eval_op(op, lv, rv):
     r"""
     Evaluate ``lv`` and ``rv`` according to the operator ``op``.

src/sage/logic/boolformula.py

@@ -148,7 +148,7 @@
                    ('->', '\\rightarrow ')]
 
 
-class BooleanFormula():
+class BooleanFormula:
     """
     Boolean formulas.
 
@@ -673,10 +673,7 @@ def is_satisfiable(self):
             False
         """
         table = self.truthtable().get_table_list()
-        for row in table[1:]:
-            if row[-1] is True:
-                return True
-        return False
+        return any(row[-1] is True for row in table[1:])
 
     def is_tautology(self):
         r"""
@@ -1309,11 +1306,11 @@ def reduce_op(self, tree):
         if tree[0] == '<->':
             # parse tree for (~tree[1]|tree[2])&(~tree[2]|tree[1])
             new_tree = ['&', ['|', ['~', tree[1], None], tree[2]],
-                       ['|', ['~', tree[2], None], tree[1]]]
+                        ['|', ['~', tree[2], None], tree[1]]]
         elif tree[0] == '^':
             # parse tree for (tree[1]|tree[2])&~(tree[1]&tree[2])
             new_tree = ['&', ['|', tree[1], tree[2]],
-                       ['~', ['&', tree[1], tree[2]], None]]
+                        ['~', ['&', tree[1], tree[2]], None]]
         elif tree[0] == '->':
             # parse tree for ~tree[1]|tree[2]
             new_tree = ['|', ['~', tree[1], None], tree[2]]
@@ -1354,10 +1351,7 @@ def dist_not(self, tree):
         if tree[0] == '~' and isinstance(tree[1], list):
             op = tree[1][0]
             if op != '~':
-                if op == '&':
-                    op = '|'
-                else:
-                    op = '&'
+                op = '|' if op == '&' else '&'
                 new_tree = [op, ['~', tree[1][1], None], ['~', tree[1][2], None]]
                 return logicparser.apply_func(new_tree, self.dist_not)
             else: